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Simple Access Control System Diagram

If a door entry reader allows proximity cards, fingerprint scans, and keypad codes for'multi-factor' authentication, access would need two or more credentials, not simply whichever credential choice was convenient for the user to offer at the moment. The illustration below illustrates a common 'three-factor' reader device:

In other words, there are two qualifications for admission: something you own and knowledge. Something you have is likely to be a keycard or fob, whereas something you know is likely to be a more personal identity that is more difficult for another person to gain, such as a PIN code, password, or face ID. For example, advanced physical access control systems will employ this multi-factor authentication technique by combining a physical barrier, such as a gate, door, or turnstile, with a user authorization credential, such as a password or biometric scan, to ensure that only authorized individuals have access to high-security areas. When access is granted using a mobile credential, the additional security provided by logical access control is immediately included. Your smartphone needs a password, fingerprint, or FaceID to open, making it more difficult for would-be thieves to get admission €” they would need to possess the phone and be able to unlock it in order to enter through the door. When it comes to data protection, implementing physical access control systems with multi-factor authentication is the first step in developing a complete cybersecurity strategy for the digital era.

Thus, the location of the float in the system notifies the controller of the tank's water level.

Assume that the water level in the tank is lower than the level indicated by the controller. Thus, the location of the float inside the tank informs the controller that the valve must remain open to allow water to flow within the tank.

A keypad is a keyless door entry system in which users obtain access by entering a numeric PIN number. Additionally, certain keypads are compatible with a mobile application that enables users to unlock keypad-controlled doors and gates directly from their cellphones. Keypads are ideal for entrance points that are seldom used by visitors, such as:

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